The bridge looks much better but it's lacking the most on the cliff faces and caves.
For example at about 0:24 that face looks completely unnatural and rugged. It's better than the flat sides but still needs work. Other ones are a concern too but try learning how to use voxel sniper (plugin) for terraforming as it helps a ton. Maybe use a variety of blocks, such as the other types of stone in the mountain faces to give them more life as well and possibly add some cool overhang features as they add tremendously.
The next one is the caves. I have a simple rule in building and that is to never spam glowstone. Sea lanterns always look better and if you use them creatively, they can fit in nicely. For example, if you use cobble walls to 'hold them up', it fits in much better. I'd also advise adding more block variety to the caves as well.
At about 1:50 you can see an example of a hillside that stands out awfully, and at the top of it , I think it is too rough for PvP.
I'm glad you have taken the time to improve the bridge so I think the watch tower and other builds could use the same treatment. I'd also recommend never using plain glass as it is just as ugly as glowstone is. Maybe have a go at custom trees too? I'm not sure but good luck in the future!
